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Note 11 - Properties (Details Textual) $ in Billions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Number of Depreciable Asset Classes	60
Cost of Property Repairs and Maintenance	$ 2.4	$ 2.1	$ 2.0
Railroad Transportation Equipment [Member]
Term of Depreciation Studies (Year)	3 years
Railroad Transportation Track Assets [Member]
Term of Depreciation Studies (Year)	6 years

X

- Definition

Information on the number of depreciable asset classes.

+ References

No definition available.

+ Details

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Namespace Prefix:	unp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Information on the term of depreciation studies to determine the estimated service lives of depreciable assets.

+ References

No definition available.

+ Details

Name:	unp_TermOfDepreciationStudies
Namespace Prefix:	unp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type: